<template>
  <div class="todo-header">
    <input type="text" placeholder="请输入你的任务名称，按回车键确认" v-model="title" @keyup.enter="add"/>
  </div>
</template>

<script>
import {nanoid} from 'nanoid'

export default {
  name: 'MyHeader',
  //接收从App传递过来的addTodo
  props: ['addTodo'],
  data() {
    return {
      //收集用户输入的title
      title: ''
    }
  },
  methods: {
    add() {
      //校验数据
      if (!this.title.trim()) return alert('输入不能为空')
      //将用户的输入包装成一个todo对象
      const todoObj = {id: nanoid(), title: this.title, done: false}
      //通知App组件去添加一个todo对象
      this.addTodo(todoObj)
      //清空输入
      this.title = ''
    }
  },
}
</script>

<style scoped>
/*header*/
.todo-header input {
  width: 560px;
  height: 28px;
  font-size: 14px;
  border: 1px solid #ccc;
  border-radius: 4px;
  padding: 4px 7px;
}

.todo-header input:focus {
  outline: none;
  border-color: rgba(82, 168, 236, 0.8);
  box-shadow: inset 0 1px 1px rgba(0, 0, 0, 0.075), 0 0 8px rgba(82, 168, 236, 0.6);
}
</style>